Water and acid proof cement and process of making same.



106. COMPOSITIONS,

COATING OR PLASTIC.

UNITED STATES PATENT OFFICE.

UTLEY WEDGE, OF ABDMORE, PENNSYLVANIA, AS SIGNOB TO ELECTED-CHEMICALSUP- PLY & ENGINEERING COMPANY, OF PHILADELPHIA, PENNSYLVANIA, ACORPORA- TION OF PENNSYLVANIA.

WATER AND ACID PROOF CEMENT AND PROCESS OF MAKING SAME.

No Drawing.

To all whom it may concern:

Be it known that I, UTLEY \Vnocn, a citizen of the United States,residing in Ardmore, Pennsylvania, have invented certain Specificationof Letters Patent.

Application filed March 1,

therewith the subsequent addition of the silicate of soda. besidesforming basic silica'fe of soda, will cause the Wm precipitate,throughout the lass, nely di- 5 Improvements in *ater and Acid Proofvided silicate orsilicate in colloidal or gelati- Cement and Processesof Making Same, of which the following is a specification.

My invention relates to that method of producing an acid proof cementwhich consists in mixing crystalline sil' such as ground Fuartz.dlaomigwig earth. or the 1m, W1 1 s1 lcate 01' so a tie o ec of my1nvent1on emg 0 pro uce a cement whlch Wlll be water-proof as well asaold-proof,

nous form, and the resulting cement will have a density and closeness oftexture not hitherto secured, and in addition to being acid-proof willalso be free from liability can be secured even when the mass of acidsaid invention consisting in adding to the used is as small as three percent. by weight silicious material an acid which, when the silicate ofsoda is added, will precipitate finely divided silica in the cement,such acid being preferably an organic acid and preferably also beingadded in powdered form.

In a previous application filed by me on of the silicious materialemployed, although the amount of acid used may vary according to theresult desired or the character of the acid used.

so l in solid form may in many the nineteenth day of.December, 1914,Serial cases prove an acceptable substitute for an 75 No. 878,199,reference was made to the familiar process of producing acid proofceacid in the compound, and the term acid as used in the claims istherefore to be interment which consisted in adding silicate of pretedas including such acid salt.

soda to silicious material.- It has been found that if this cement afterapplication in construction is brought into contact with aqueoussolutions of sulfuric acid hydrochlgric q or gltEiC ac1 1 ar ens percep1 y on u it has also been found that cement made in this way whensubjected for a long time to the action of w ter becomes permeated withmoisture and 1s- I claim:

1. As an improvement in the manufacture of acid-proof cement by mixingsilicious material and silicate of soda, the mode herein described ofrendering the cement waterproof, said mode consisting in adding silicateof soda to the silicious material aiid, previous to such addition,adding to the silicious material an acid which will, on the integrates,the formation of the thin film of later addition of the silicate ofsoda, act as a hard or dense material at the surface in the mannerdescribed not being suflicient to protect the interior mass of thecement from the action of moisture.

It has likewise been found that this cement, when used in constructingthe wall of a tank or tower, is hardened and made superficially dense atthe interior face where it is in contact with acid but that the exteriorof the structure, which is not in contact with cious material an acidwhich will, on the acid, becomes.disintegrated on exposure to water ormoisture.

In attempting to overcome this difficulty it has been found that if anacid in solid later addition of silicate'of soda, precipitate silica ina gelatinous or colloidal state.

3. As an improvement in the manufacture of acid-proof cement by mixingsiliform, preferably an or anic acid such as cious material and silicateof soda, the mode e oleic aci d or the 1'6 n-"""-- sae,1saedtothe hereindescribed of renueriri'g' the cement water-proof, said mode consistingin adding silicate of soda to the silicious material, and,

previous to such addition, adding to the siliname to this specification,in the presence ciogs 1material finely ddifvided farm, an of twosubscribing Witnesses. aci a so in fine y ivide orm an which 4 7 wi11,onthe addition of the silicate of soda, UTLm WEDGE- precipitate finelydivided silica in the Witnesses: cement. KATE A. BEADLE,

In testimony whereof, I have signed my HAMILTON D. TURNER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, I). G.

